Patent GB-191003395-A (GB)
Title: Improvements in Ribbon Vibrator Mechanism for Visible Typewriting Machines.
IPC: B41J35/00
Filed: 1910-02-11
Granted: 1910-08-11
Abstract: 3395. Marks, E.C.R., [Royal Typewriter Co.]. Feb. 11. Ink - ribbon mechanism ; ribbonkey actions. - Relates to variablethrow vibrator mechanism. In the arrangement shown in Figs. 1 and 3, a link 15, which is moved endways by the universal bar 33, is formed with a large aperture into which projects a lateral pin 12 on a bell-crank lever 6, 11 connected to the vibrator 9. The aperture is formed with steps 18, 19, 20, and the link can be adjusted to bring any of these steps opposite the pin 12 and thereby adjust the throw of the vibrator. The steps 18, 20 respectively engage the pin with a close and a lost motion, and impart a full or half-throw to the vibrator. The step 19 does not reach the pin, so that no motion is imparted to the vibrator, this being the stencil adjustment. The link 15 is carried by arms 17, 16, the latter arm being carried by a crank 62 on a rock-shaft 48, which is operated by keys 53, 54, 56 and is provided with a stop 61 having faces a, b of different radius for arresting the upward movements of the vibrator. The keys 53, 54 are pinned to a lever 51, which is pivoted at 52 and is connected by a link 50 to the shaft 48. The keys 53, 54 swing the lever 51 in opposite directions and rock the shaft 48 to bring the step 18 or 20 opposite the pin 12 and simultaneously rotate the stop 61 to bring the face a or b into position to arrest the vibrator by engaging a lug 6<1> on the bell-crank lever. The key 56 is for the stencil adjustment and is mounted on a slide 57 provided with pins 59, 60, which may engage the lever 51 and bring it to the vertical position as shown in Fig. 1, thereby bringing the step 19 opposite the pin 12. The link 15 is operated by an arm 45 of the universal bar 33 engaging a pin 47 on the link. The arm 45 is pivoted at 39 on the central arm 37 of the universal bar and is provided with an adjusting-screw 42 and a clamp screw 44 which passes through a slot in the arm 45. The parts are so adjusted that when the vibrator is at the top, the arm 45 is pressing on the pin 47, the step 18 or 20 is pressing on the pin 12, and the lug 6<1> is pressing on the stop face a or b. A detent consisting of a spring-pressed ball engaging grooves in the shaft 48 is provided for holding the parts in the set position. The vibrator is arrested and held in the lower position by a screw stop 14 engaging an extension 13 on the bell-crank lever 6 and by a spring 23 which is connected to the arm 11 and to an arm 22 on the arm 17. The link 15 and the bellcrank lever 6,11 are carried by the shift-rail 3 of the platen so that the platen may be shifted without interfering with the vibrator-devices. In a modification, the link 15 is dispensed with and the arm 45 of the universal bar engages the front of the arm 11 of the bell-crank lever, and the vibrator is constantly urged upwards by a spring which is connected to an extension of the arm 6. When the machine is operated, the arm 45 leaves the arm 11 and permits the bell-crank lever and the vibrator to move upwards till the lug 6<1> engages the stop 61, which in this case is provided with an additional stop-face corresponding to the stencil adjustment. In another modification, shown in Fig. 11, the vibrator 9 is pivoted to a bell-crank lever 6, 11 which is pivoted at 5 to the platen-frame. The arm 11 is pivoted to the lever 95, which is formed with stepped surfaces 97, 98 adapted to be engaged by a projection 99 on an arm 91 of the universal bar 90, which in the known manner is carried by arms 82 journaled on a shaft 81 and is operated by links 92<1> connected to the key-levers. The lever 95 is connected by a link 100 to an arm 101 on a rock-shaft 103, which may be turned by a switchkey 105 so as to bring either of the surface 97 or 98 opposite the projection 99, thereby giving a full or a half-throw to the vibrator ; the key 105 may also swing the lever 95 clear of the projection 99, this being the stencil adjustment in which no motion is imparted to the vibrator. The arm 101 is formed on a block 102 which is made with five flats, the three upper flats 107,108. 109 co-operating with a flat spring 110 to hold the shaft 103 in positions corresponding to the " half throw," " no throw " and "full throw " of the vibrator. The flat 111 and the corner between the flats 111, 112 respectively form stops for arresting the lever 95 and the vibrator at the top of the throw in the full and half throw adjustments. The switch-key 105 is pivoted at the bottom and is connected by a link 50 to an arm on the rock-shaft 103. The lever is held by a spring 113 against one of the stops 114, 115, 117, these stops respectively corresponding to the stencil, halfthrow, and full-throw adjustments. The stop 115 is carried by a spring arm 116 which may be pressed laterally to release the lever. The bell-crank lever 6, 11 is carried by the shift-rail 4 so that the platen may be shifted without interfering with the vibrator-devices.